PSP Audio's MixSaturator VST plug-in ($30) replicates saturation effects common in tube circuits and analog tape recorders. The plug-in features three algorithms with a wide range of variation.

The Analog Saturation Simulator includes a selection of seven types of nonlinear saturation curves. Frequency-dependent processing is also available: the bass algorithm adds low-end harmonics; the treble algorithm simulates tape saturation of the upper frequencies, but without an increase in distortion or aliasing.